*`objectName` - (Optional) The name of the state file (defaults to `terraform.tfstate`)
The following [Manta environment variables](https://apidocs.joyent.com/manta/#setting-up-your-environment) are supported:
*`MANTA_URL` - (Required) The API endpoint
*`MANTA_USER` - (Required) The Manta user
*`MANTA_KEY_ID` - (Required) The MD5 fingerprint of your SSH key
*`MANTA_KEY_MATERIAL` - (Required) The path to the private key for accessing Manta (must align with the `MANTA_KEY_ID`). This key must *not* be protected by passphrase.